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From: Tejas Joshi <tejasjoshi9673@gmail.com>
Date: Thu, 22 Aug 2019 07:57:00 -0000
Message-ID: <CACMrGjD9oR6jJrN+XJZYsEW+Oheo4uV2JRxm35KX326A07ayrQ@mail.gmail.com>
Subject: Re: Expansion of narrowing math built-ins into power instructions
To: gcc@gcc.gnu.org
Cc: Martin Jambor <mjambor@suse.cz>, hubicka@ucw.cz, joseph@codesourcery.com, 	segher@kernel.crashing.org
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> What happens then?  "It does not work" is very very vague.  At least it
> seems the compiler does build now?

Oh, compiler builds but instruction is still "bl fadd". It should be
"fadds" right?


On Thu, 22 Aug 2019 at 11:55, Segher Boessenkool
<segher@kernel.crashing.org> wrote:
>
> Hi Tejas,
>
> [ Please do not top-post. ]
>
> On Thu, Aug 22, 2019 at 09:09:37AM +0530, Tejas Joshi wrote:
> > Yes, I tried basically every combination I could think of, just not
> > with the "isa attr". Now, I have the following code and it is still
> > seems not to be working. Am I missing any options to pass?
> >
> > (define_insn "add_truncdfsf3"
> >   [(set (match_operand:SF 0 "gpc_reg_operand" "=f,wa")
> >           (unspec:SF [(match_operand:DF 1 "gpc_reg_operand" "%d,wa")
> >                              (match_operand:DF 2 "gpc_reg_operand" "d,wa")]
> >                               UNSPEC_ADD_NARROWING))]
> >   "TARGET_HARD_FLOAT"
> >   "@
> >    fadds %0,%1,%2
> >    xsaddsp %x0,%x1,%x2"
> >   [(set_attr "type" "fp")
> >    (set_attr "isa" "*,p8v")])
> >
> > with the code, I pass -O2 foo.c :
> > float
> > foo (double x, double y)
> > {
> >    return __builtin_fadd (x, y);
> > }
>
> What happens then?  "It does not work" is very very vague.  At least it
> seems the compiler does build now?
>
>
> Segher